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Triode Transistor
Triode Transistor
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Old 20th February 2019, 05:25 PM   #11
Nelson Pass is offline Nelson Pass  United States
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Triode Transistor
Clearly you can get some triode action out of these parts.

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Old 21st February 2019, 12:04 AM   #12
PRR is offline PRR  United States
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Why buy transistors from a fuse company??

A simple test for "good audio triode" might be: Is the plate dynamic resistance less than a happy load resistance? And is it linear?"

See attached. Insufficient data-- we normally want a lot more than 10V available swing into a speaker (even if 4V covers 99.44% of listening). However probably nothing whacky happens at higher voltages. I assumed 24V in 8 Ohms, red line. Are the plate curves (drain, green) steeper or flatter than the usual load? Over the range 24V to 10V (14V peak audio) it seems very likely the "plate" is HIGHer impedance than our load.

Yes, as we come to 6V across the device (18V across load) the device impedance is as low as the load. At 3V on device we are down to 1 Ohm plate resistance, great! Except we can only swing to 2V on device, so we don't get lowish plate resistance until 80% of maximum output--- anything less is really more pentode-like than triode-like. And in that last 20%, linearity is slammed... "soft clipping" is a virtue sure, but the cushion is thin.

But a a wise man has said: "any tool can be the right tool". If you like low-low-Z loads (ribbons, massive parallel, step-up iron) then it can be more triodey. If you series-stack a lot of $10 parts (and their drives) it will be more triodey. All the tricks of analog computation are available to transmogrify impedances and curves.
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Old 22nd February 2019, 12:50 AM   #13
oon_the_kid is offline oon_the_kid  Malaysia
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Hi,

You are right in the sense it is no truly a straight line. I suppose I should have qualified it by saying triode 'like' rather than triode transistor. I say triode like in the sense the as Vds drops, current drops as well, as opposed to normal Mosfet where the current remains constant.

Oon
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Old 22nd February 2019, 12:53 AM   #14
oon_the_kid is offline oon_the_kid  Malaysia
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Quote:
Originally Posted by Nelson Pass View Post
Clearly you can get some triode action out of these parts.

Thanks Nelson, I also took up your advise and read up more about the F3. Brilliant way of using cascode to reduce distortion. I might do this as a cascode and link it up with a coil. The power of this guy is not very high as Zen mod pointed out and using a cascode will reduce power dissipation.

Oon
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Old 22nd February 2019, 05:04 PM   #15
Nelson Pass is offline Nelson Pass  United States
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Triode Transistor
I bought some of these yesterday, so I'll have some data after a bit.
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Old 22nd February 2019, 09:29 PM   #16
Blues is offline Blues  United States
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Quote:
Originally Posted by Nelson Pass View Post
I bought some of these yesterday, so I'll have some data after a bit.
Time to update F3, ZenV9?

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Old 22nd February 2019, 09:48 PM   #17
Nelson Pass is offline Nelson Pass  United States
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Triode Transistor
Who knows? biggest hurdle is busy calendar.....
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Old 22nd February 2019, 11:52 PM   #18
Soundhappy is offline Soundhappy  France
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Or update the future new one's
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Old 14th March 2019, 12:23 PM   #19
Nag is offline Nag  India
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Is this device characteristics interesting in future release ?.

Development of world's first vertical gallium oxide transistor through ion implantation doping
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Old 14th March 2019, 06:11 PM   #20
Nelson Pass is offline Nelson Pass  United States
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Triode Transistor
More recently, actual SIT parts were developed at UC Davis.
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